Discussion
Which quantity does the Earth export to space?
Answer: A
The Earth receives energy in a small number of high energy solar photons and emits the same energy as a much larger number of low energy infrared photons, so it exports far more entropy than it receives. Energy is exported at the same rate it is received in the long term mean. That entropy export is what permits the maintenance of the ordered structures of the circulation and of life. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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